Scans have shown that patterns of activity in the brain __20__ according to how we focus on a task.When we are __21__，we concentrate more on how time is passing.And this makes us __22__ the clock is ticking more slowly.

　　In an experiment __23__ by a French laboratory,12 volunteers watched an image __24__ researchers monitored their brain activity.

　　The volunteers were told to __25__ concentrate on how long an image appeared，then __26__ the color of the image，and third，study both the duration and the color.The results showed that the __27__ was more active when the volunteers paid attention to __28__ subjects.

　　It is thought that if the brain is __29__ focusing on many aspects of a task，it has to __30__ its resources，and pays less attention to the clock.__31__，time really passes without us __32__ it，and seems to go quickly.If the brain is not so active，it concentrates its __33__ energies on monitoring the passing of time.__34__，time seems to drag.

　　Next time you feel bored __35__，perhaps you should pay more attention to what the teacher is saying!

　　16．A.guess

　　B．learn

　　C．believe

　　D．doubt

　　17．A.view

　　B．point

　　C．scene

　　D．experience

　　18．A.drags

　　B．stops

　　C．backs

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